Florian Champiré

Ministère de l'Écologie, du Développement durable, des Transports et du Logement | développement durable

This paper investigates the compaction characteristics of raw earth via a double-faced static compaction and the traditional Proctor test (dynamic process). The corresponding compaction energies are estimated for each individual sample, while the matric suctions are measured by a simple method using filter papers. The obtained results allow to draw...

Rammed earth is a monolith structure constructed by compacting partially saturated soil in layers within a formwork. Few studies have pointed out the lack of experimental data on rammed earth layer interface strength and their importance in design consideration. Currently available testing procedures such as shear box, triaxial, triplet, push-over...

The article Modelling the poroplastic damageable behaviour of earthen materials, written by Longfei Xu, Henry Wong, Antonin Fabbri, Florian Champiré and Denis Branque, was originally published online without Open Access. After publication in volume 51, article ID 112 RILEM decided to grant the author to opt for open choice and to make the article a...

This paper presents a new constitutive model on the poroplastic behaviour of earthen materials accounting for stiffness degradation, using the approach of continuum damage mechanics. The poroplastic behaviour is modelled based on the bounding surface plasticity (BSP) theory and the concept of effective stress while isotropic damage is modelled usin...

This paper investigates the impact of clay and moisture contents on the shear behavior of compacted earth taking into account loading-unloading cycles. Fine sand was added to a natural soil, thereby obtaining three different soils with clay contents of 35%, 26%, and 17%, respectively. A series of triaxial tests was conducted on samples previously e...

Le matériau terre peut apporter une réponse face aux problèmes que les constructions modernes rencontrent en termes d’enjeux sociétaux, économiques et écologiques. Cependant, les difficultés à comprendre et à prédire son comportement représente un obstacle au développement de cette technique dans les pays développés. Cette thèse s’insère dans un pr...

In order to explore the hydro-thermo-mechanical behaviour of compacted earth, triaxial apparatus at controlled temperature and equipped with non-contacted sensors measuring system, was developed. The results show that the relative humidity at which the samples were stored have a strong impact on the mechanical characteristics of earthen material: b...

The aim of this study is to assess the mechanical behavior of earthen materials when submitted to spatial and temporal variations of temperature and hygrometry. The first step of this study is to quantify the effects of heat and mass transports, including the phase changes occurring within the pores, on the hygrothermal behavior. This information i...

Earthen buildings can provide an answer to face difficulties in modern constructions in both terms of sociology, economics as well as ecology. However, the difficulty to understand and to predict their long term behavior represents an obstacle to their spreading. In some cases for example, unsuitable repairs on old constructions can lead to catastr...

La réglementation thermique et la demande des habitants poussent à l’isolation du pisé. Mais une isolation inadaptée au bâti en terre crue peut entraîner la perte du confort hygrothermique qui a fait la réputation de ce matériau naturel, ainsi qu’un risque de pathologie humide. Les recherches scientifiques en cours à l’ENTPE sur le fonctionnement h...